Steam-superheating apparatus.



' aw/ Menace E. H. POSTER.

STEAM SUPBRHEATING APPARATUS.

APPLIUATION FILED OCT. 28, 1909,

Patented Dec. 10, 1912.

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A- I v APPLICATION ILED OCT. 28, 1909. l gqgiflg'f Patented Dec. 10,1912.

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STEAM SUPBRHEATING APPARATUS.

APPLICATION FILED OCT. 28, 1909.

Patented Dec. 10, 1912.

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STEAM SUPEHHEATING APPARATUS.

' APPLIOATION FILED 031 28 1909. gqv ggy", Patented Dec. 10, 1912.

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Specification of Letters Patent.

Patented Dec. 10,, 1912.

Application ma October as, was; Serial No. 525,085.

- fuil, clear, and exact description;

This invention relates to steam superheat- 'ing apparatus, moreparticularly-forsteam boilers of the type in which .the boilerdrums,arranged one vertically above the other, are connected by verticalwater-tubes.

So far; as I am aware, the schemes heretofore proposed, for boilers ofthe special type referred to, have not been as successfill in practiceas 'hoped for, and I have therefore been led to devise my present invention, which has for its chief objectto provide for the purpose asuperheating ap paratus which shall be efficient in operation, and alsoconvenient in arrangementfand position so as to permit ready access forinspection, repair, ete.

To these and ether ends the invention consists in the ncvei features ofconstruction, arrangement of I rt andcombinations of elementshereinafter described, and more particularly set forth in the'appendedclaim.-v In the annexed drawings I have illustrated, somewhatdiagrammatically, a convenient and effective embodiment of the invention, in connection with boilers .of the generic type mentioned, andreferring now thereto, Figure g1 is a vertical section; showing thesuperheater applied to a boiler in which the oiler tubes occupy a spacewhich is plane or flat at the front, next to the superheater; theboiler-drums being arranged with their axes-horizontal. Fig. 2 is afront wiew of thesam with the front wall of the boiler-settingv-'inoved. Fig. 3 is a vertical section Show}; the superheater applied toa boiler in/w 1ch the boiler-tubes occupy a space tily'olyis more onless cylinvdrical, or curved toward the" superheater,

the upper drun alone being shown, arranged with its axis ,v'ertical.Fig. 4 is a horizontal section, online IYQ JV of Fig. 3.

The boiler setting in Figs. '1] and 2 is des ignated by 1,- and incloss"the boiler drums, the lower or mud drum being" designated by 2- and theupper or steam drumby 3. Be tween the drums are the vertical watertubes4, which, it will'be observed, approach closely to the front endrearwalls of the setting. At the front, adjacent to the lower drum, is theboiler furnace, 5. Extending upwardly from the lower drum, anddownwardly from the upper, aretwo battles, 6.

and 7 respectively, so that the course of the gases from the" furnacewill be upward in front of the first baflie, downward bet-ween the two,and upward in rear of the second baflie, the gases thence flowingthrough the opening 8 to the stack.

In the front wall of the setting is a horizontally disposed chamber 9,in which the horizontal inlet and outlet headers, 10 andll-respectively, of the superheater, now to be described, are arranged.By preference the headers extend entirely across the boilerset-ting, sothat-the connection of the inlet header with the steam-supply pipe 12, bv

Which steam is delivered to the header from the upper drum, and theconnection of the outlet header with the steamiine, c-anfboth be madeoutside of the'sett-ing, as shown.

At the front of the header chamber is a suitable closure, as a door 12,which can be opened to afford access to the interior of the chamber.

The U-sha'ped superheating elements or tubes 13, connecting the headers,extend rearwardly and upwardly therefrom, and occupy. the relativelynarrow space between the front row' of boiler tubes and the frontwallof' the setting. These elements may be of any approved construction,but are preferably of the type described in my prior Patent No. 744,323,issued Nov. 17, 1903, and i the patent of L. B. Nutting, No. 921,878,issued May 18, 1909. At a suitable point, say about .half-way up thesuperheating ele- 'ments, is a bafiie 14, extending horizontally andforwardly from the front vertical baflle 6, the'function of thehorizontal baflie being to deflect the upwardly flowing furnace gasesinto and among" the said elements,

which are thus effectively subjected to the hot products. of combustionbefore the latter 101a given up much of eir heat to the 1 Int-he type ofboiler illustrated in Figs. I

, 3 and 4 the front row of boiler tubes, 15, is curved, and theaxis ofthe upper drum, 16,

is' .vertical. However, instead of, being curved the headers, 17 and 18,are preferably straight, as shown, in which case the horizontal portionsof the superheating tubes orelements 19 are graded in length,

as illustrated, to bring the vertical portions same. purpose as thecorresponding the front is a horizontal baffle 21', for "the battle inthe arrangement illustrated in Fig. 1. The

I let header, 17 is connected to the mounted on the innerends headerchamber 22 is also of the same general type as the chamber ,9, and isprovided with one or more doors, as 23, to afford access to the interiorwhen desired. The indrum 16 by a steam supply pipe 24. p

In the construction shown in Fig. 1-, the superheating tubes aresupported. in vertical position by a transverse box or angle 25, ofsuitable rods or bolts 26 extending through the-front wall of thesetting, andfin Fig. 3 thedesired suport is afforded by a curved memberor bar 27, suspended. by hangers 28 from a bracket 29 .on the drum 16.Each header may be 'provided'with a-draincock, not shown, for convenientdrainage of water therefrom.

The operas-ion in "both the constructions described is apparent. 1 Thesteam, delivered to the inlet 'nea'derthrough the steam supply pipe,flows through the superheating tubes and is in its course subjected tothe heat of the furnace gas-. Being in the first pass of the boiler, thetemperature encountered by thesuperheater is high, so that an effectivedegree of superheat is assured. From the outlet header the steam flowsto the steam li'ne and thence to the point of uti .lization. Thesuperheateroccupies a minimumamount of space, in" fact it occupiespractically only/what would otherwise be -tubes being such that thewaste space, only slight recessing or advancing ofthe front wall of thesetting being necessary, if at all. Although the superheating tubesthemselves are high. heat, aslbefore stated,-the headers are out of thedirect current of the gases and hence the'header joints are notsubjected to injurious temperatures.

While the structures illustrated are the preferred forms, it is tobeunderstood that the invention is not limited thereto,.but may beembodied in other forms without departure from its proper spirit andscope as defined by the appended claim.

What I claim is:

The combination of a steam boiler, comprising upper and lower drumsconnected by vertical boiler tubes, a curved. boiler setting having itsfront wall adjacent to the boiler tubes and having a furnao in the lowerend thereof, a superheater comprising substantially straight inlet andoutlet headers locatedin a chamber in said front wall and without thepath of the hot gases, horizontal tubes of graded length connected toand 'ex; tending inward from said headers, substantially U-shapedvertically extending superheating tubes connecting said. horizontaltubes, the length of the superheating tubes are in the-path of the hotgases at the out side edge .of the boiler tubes, and means fordeflecting the hot gases passing from the furnace among said superheaterelements.

In testimony whereof I affix my signature inthe presence of twosubscribing witnesses.

ERNEST H. FOSTER.

Witnesses: p

M. LAWSON DYER,

S. S..DUNHAM.

aforesaid horizontal subjected to

